RAINDROP DETECTING APPARATUS

RAINDROP DETECTING APPARATUS

PROBLEM TO BE SOLVED: To inhibit malfunctioning by a low cost without preparing a special circuit for temperature compensating. SOLUTION: A raindrop detecting apparatus has a temperature detecting means 10 or 22 for detecting an environmental temperature which surrounds a light emitting element 8 an...

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Bibliographische Detailangaben
1. Verfasser: KURAHASHI AKIRA
Format: Patent
Sprache:eng
Schlagworte:
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
METEOROLOGY
PERFORMING OPERATIONS
PHYSICS
SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, ORMANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
TESTING
TRANSPORTING
VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To inhibit malfunctioning by a low cost without preparing a special circuit for temperature compensating. SOLUTION: A raindrop detecting apparatus has a temperature detecting means 10 or 22 for detecting an environmental temperature which surrounds a light emitting element 8 and a photoelectric converter 9. An arithmetic processing circuit 12 increases a threshold when it judges that the raising fraction of the environmental temperature is not less than a predetermined value at the time of fine judging, compares a threshold after the increase with the amount of output changes calculated based on a former output amplitude and a current output amplitude, and thereby judges a fine or a rain. COPYRIGHT: (C)2007,JPO&INPIT